Smalll doc fix

[David Bateman]

Perhaps a change like the attached is a good idea as the
sparse_auto_mutate capability is off by default.

D.

-- 
David Bateman                                address@hidden
Motorola Labs - Paris                        +33 1 69 35 48 04 (Ph) 
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*** doc/interpreter/sparse.txi.~1.29.~  2007-11-22 22:28:13.000000000 +0100
--- doc/interpreter/sparse.txi  2007-12-20 12:54:10.747294018 +0100
***************
*** 535,543 ****
    0  0  1
  @end example
  
! returns a full matrix as can be seen. Additionally all sparse functions
! test the amount of memory occupied by the sparse matrix to see if the 
! amount of storage used is larger than the amount used by the full 
  equivalent. Therefore @code{speye (2) * 1} will return a full matrix as
  the memory used is smaller for the full version than the sparse version.
  
--- 535,546 ----
    0  0  1
  @end example
  
! returns a full matrix as can be seen. 
! 
! 
! Additionally, if @code{sparse_auto_mutate} is true, all sparse functions
! test the amount of memory occupied by the sparse matrix to see if the
! amount of storage used is larger than the amount used by the full
  equivalent. Therefore @code{speye (2) * 1} will return a full matrix as
  the memory used is smaller for the full version than the sparse version.
  
***************
*** 564,569 ****
--- 567,577 ----
  always returns a sparse matrix, even if the memory used will be larger 
  than its full representation.
  
+ @DOCSTRING(sparse_auto_mutate)
+ 
+ Note that the @code{sparse_auto_mutate} option is incompatible with other
+ products, and so it is off by default.
+ 
  @node MathConsiderations, , ReturnType, Operators and Functions
  @subsubsection Mathematical Considerations